US4295630A - Fail-safe actuator and hydraulic system incorporating the same - Google Patents

Fail-safe actuator and hydraulic system incorporating the same Download PDF

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Publication number
US4295630A
US4295630A US06/065,368 US6536879A US4295630A US 4295630 A US4295630 A US 4295630A US 6536879 A US6536879 A US 6536879A US 4295630 A US4295630 A US 4295630A
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US
United States
Prior art keywords
piston
port
spring
valve
actuator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/065,368
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English (en)
Inventor
Lorin P. Card
Otto W. Borsting
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GREE HYDRAULICS OF CALIFORNIA Inc
Shared Technologies Fairchild Telecom Inc
Original Assignee
Greer Hydraulics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Greer Hydraulics Inc filed Critical Greer Hydraulics Inc
Priority to US06/065,368 priority Critical patent/US4295630A/en
Priority to CA000350970A priority patent/CA1140837A/en
Priority to JP9491580A priority patent/JPS5628304A/ja
Priority to DE19803027181 priority patent/DE3027181A1/de
Priority to SE8005576A priority patent/SE8005576L/sv
Priority to US06/281,087 priority patent/US4412670A/en
Application granted granted Critical
Publication of US4295630A publication Critical patent/US4295630A/en
Assigned to GREE HYDRAULICS OF CALIFORNIA, INC. reassignment GREE HYDRAULICS OF CALIFORNIA, INC. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: GREER HYDRAULICS, INCORPORATED, GREER HYDRAULICS OF CALIFORNIA, INC.
Assigned to VSI CORPORATION reassignment VSI CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE 12-16-81 Assignors: GREER HYDRAULICS, INCORPORATED
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/005—Leakage; Spillage; Hose burst
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/002—Electrical failure

Definitions

  • the present invention is in the field of fail-safe actuator devices and systems incorporating the same and pertains more particularly to a fail-safe actuator for use in conjunction with a control device utilized in a hydraulic control system.
  • a control device such as a valve
  • a certain sense in the event of a power failure or like happening.
  • a valve in the event a rupture of the line is sensed, it is necessary that a valve be actuated to interrupt fluid flow in the oil line.
  • the present invention may be summarized as directed to a fail-safe actuator and hydraulic system incorporating a valve operatively connected to the actuator, characterized in that the fail-safe actuator employs an energy storage device such as a spring mechanism which, when once cocked by the application of fluid under pressure, is retained in the cocked position during normal operation of the valve and only when the fluid is released will the spring be operative to control the valve.
  • the spring of the actuator need not be compressed or cocked during each cycle and the spring, when once cocked, remained in the cocked condition, avoiding recycling and consequent premature fatigue thereof.
  • the fail-safe actuator comprises a casing having a port at one end and housing a piston mounting one end of a piston rod.
  • the energy storage spring is biased between the piston and the other end of the casing.
  • the other end of the piston rod projects beyond the other end of the casing and is operatively connected to the apparatus to be controlled, by a flexible cable member arrayed over an arcuate surface of a yoke fixed to the control shaft of the fail-safe actuator which shaft is operatively connected to the shaft of a control device or valve.
  • control shaft is axially coupled to the shaft of a hydraulic rotary actuator assembly, illustrative in the form shown and described in U.S. Pat. No. 3,839,945, and the shaft of said rotary actuator is axially coupled to the shaft of the valve illustratively of the rotary type.
  • the cable is so connected that in normal operation of the system it will be in tensioned condition over the surface of the yoke in one limiting position of the valve and in slackened condition when the valve is moved from the one to a second limiting condition. The cable thus does not interfere with the normal operation of the valve by the rotary actuator.
  • the fail-safe actuator senses a failure in the system the cocked spring is released and the cable is drawn by the piston rod in such manner as to cause rotation of the yoke and control shaft to which it is attached, thereby moving the shaft of the rotary actuator and the shaft of the valve to the failure position.
  • an object of the invention to provide an improved actuator device to be used as a fail-safe member in a hydraulic system or the like.
  • a further object of the invention is the provision of an energy storing fail-safe actuator device which will permit independent cycling of the apparatus which it controls without cycling of the energy storage spring of the actuator device, whereby the energy required for normal operation of the controlled apparatus is not materially increased by the presence of the fail-safe actuator.
  • a further object of the invention is the provision of a fail-safe mechanism of the type described wherein cycling of the spring energy storing means during normal operation of the valve or like control assembly is avoided, thus greatly increasing the effective life of the spring assembly.
  • FIG. 1 is a longitudinal sectional view through a fail-safe actuator device in accordance with the invention.
  • FIGS. 2, 3 and 4 are diagrammatic views of a manually controlled valve incorporating a fail-safe actuator device in accordance with one embodiment of the invention.
  • FIGS. 5, 6 and 7 are diagrammatic views of a hydraulic control system utilizing the fail-safe actuator device in accordance with another embodiment of the invention.
  • FIG. 1 a fail-safe actuator device A comprising an elongate casing 10, cylindrical in transverse section, to which is fixed a housing 11.
  • the housing 11 may comprise a tubular fixture having its axis perpendicular to the axis of casing 10 and having mounting feet 13 illustratively formed integral therewith and having an operating shaft 14 journalled for rotation therein.
  • the casing 10 includes a flow port 16 at one end 17 thereof.
  • the flow port 16 is formed in a disk-shaped end plate 18, which is fixed in position as by roll forming an annular lip portion 19 of the casing over an annular proturbance 20 of the end plate 18.
  • the end plate 18 includes a radially outwardly directed circumferential groove 21 carrying O-ring 22, whereby the disk 18 is securely retained in the end 17 of the casing in a leak-free sealing relation with respect thereto.
  • the plug assembly includes an enlarged annular flange 25 having a forwardly facing shoulder 26 maintained in abutting relationship against the end edge 27 of the casing by a locking disk 28 which may be spun over the flange 25 and the outwardly flared end portion 23 of the casing securely to retain the plug assembly 24 in co-axial alignment within the casing.
  • the plug assembly 24 includes an externally threaded reduced neck portion 29 projecting beyond the casing.
  • the housing 11 is secured to the neck 29 by engagement of internally threaded integral collar 30 with the threading of the neck portion 29.
  • the plug assembly is provided with an integral axially directed bore 31, within which is slidably guided piston rod member 32.
  • the distal end 33 of the piston rod member is threadedly connected as at 34 with the piston 35 next to be described.
  • the piston 35 includes a reduced diameter trailing portion 36 defining an annular shoulder 36'.
  • the forwardmost or enlarged head 37 of the piston carries a packing or gasketing arrangement 38 slidably engaging and defining a tight seal with the internal bore 39 of the casing 10.
  • the gasketting or seal arrangement 38 may include a seal section 40 which is generally T-shaped in transverse section, the seal arrangement being mounted within a radially outwardly directed peripheral groove 41 in the enlarged head portion 37 of the piston.
  • a pair of annular spring retainer rings 42, 43 are mounted over the seal section 40, forwardly and rearwardly of the projecting sealer portion 44 thereof, whereby the seal 40 is retained in position within the groove 41.
  • the rearwardmost end 45 of the piston rod is externally threaded as at 46 for the mounting of a stop and adjustment nut 47.
  • said end 45 of the piston rod includes an internally tapped bore 48.
  • the bore provides an anchor or attachment means for threaded insert member 49 fixed to one end of a flexible cable 50.
  • the insert member 49 is threadedly engaged within the tapped bore 48.
  • a cable lock nut 51 is threaded over the extending portion of the insert 49 and tightened against the rearmost surface of the nut 47, whereby the depthwise adjustment of the insert 49 relative to the rod 32 may be accurately established.
  • the shaft 14 has secured thereto a yoke 52 which illustratively comprises 90° of arc, the yoke including a recessed, radially outwardly open track 53.
  • the cable is arrayed over the arcuate track 53, the distal end 54 of the cable having an enlarged stop clamp 55 mounted thereover.
  • a retainer pin 56 is extended transversely through the yoke, adjacent the stop clamp 55 and outwardly of cable 50 assuring that the cable is retained to the yoke.
  • An adjustment assembly 57 is provided for accurately establishing the rotary position of the yoke 52 which is keyed to the shaft 14.
  • the adjustment assembly 57 may include a set screw member 58 mounted within a complementally threaded bore 59 formed in the housing 11.
  • the set screw member includes a stop end portion 60 disposed in the path of stop shoulder 61 formed on the yoke.
  • the set screw 58 is locked in position by a lock nut 62 threaded over the set screw, a lock washer 63 preferably being interposed between the nut 62 and the flat stop shoulder 64 formed on the housing.
  • An energy storing device in the form of a coil spring 65 is mounted within the casing 10.
  • the spring 65 has an outer end portion 66 surrounding spring retainer neck 67 of the plug assembly 24, said portion 66 being biased against shoulder 68 of the plug assembly.
  • the innermost end 69 of the spring 65 is biased against rearwardly facing annular shoulder 36' formed on the piston.
  • the piston assembly comprised of the piston rod 32 and piston 35, are axially moveable within the casing 10 between limiting positions shown in FIG. 1, namely, the solid line energy storing or cocked position of the spring and the dot and dash energy releasing or uncocked position of the spring.
  • the fail-safe actuator assembly described is intended to provide motive power for moving a control device such as the shaft of a ball valve or the like, from an open to a closed position, for example, in the event of a failure in the system controlled by the valve, which failure is detected by a suitable sensor 70 which may be pressure actuated or actuated by a power failure, as is well known.
  • FIGS. 2, 3 and 4 wherein a basic form of incorporation or utilization of the fail-safe actuator assembly A, shown in FIG. 1, is illustrated diagramatically, the shaft 14 of the actuator assembly is attached to the shaft 14', of a manually actuated ball valve V.
  • the shaft 14' has been manually rotated by handle 71 such that the valve V is illustratively in the open position.
  • pilot valve 74 is actuated by energizing its coil 76 through the sensor 70.
  • the pressure inlet port P-1 and pressure outlet port P-2 of pilot valve 74 will be connected, so that fluid under pressure may flow from pump P through the associated one-way check valve CV and conduits 72 and 73 into port 16 of the fail-safe actuator to react against piston 35 to retain the latter in its upper-most position in which the coil spring 65 is cocked.
  • the valve V may be manually moved to closed position by rotating handle 71 in a clockwise direction from the position shown in FIG. 3 to the position shown in FIG. 4. This will cause the shaft 14' and the shaft 14 of the fail-safe actuator connected thereto to rotate in a clockwise direction and also rotate the yoke 52 in the same direction.
  • the spring 77 of the pilot valve 74 will be effective to shift the movable member of the pilot valve 74 to the position indicated in FIG. 2, whereupon the port P-1 is closed and the port P-2 is connected to discharge port P-3 which is connected to a reservoir R. Connection of the conduit 73 through ports P-2 and P-3 to the reservoir R, will enable the fluid in the chamber C of actuator A to be discharged through port 16 by the force of the compressed spring 65 reacting against the piston 35. This will cause the piston rod 32 to be shifted toward the end plate 18 (FIG. 1).
  • the fail-safe actuator A is used in conjunction with a hydraulically operated rotary actuator 83 of the type described in U.S. Pat. No. 3,839,945, interposed between the fail-safe actuator A and valve V for remote operation of the valve V by the energization and deenergization of coil 84 of control valve 82 associated with the rotary actuator 83.
  • pilot valve 74 is associated with the fail-safe actuator A, the coil 76 of the valve being controlled by sensor 70.
  • control valve 82 is energized through a switch S and sensor 70 to connect its ports P-4, P-5 and P-6 P-7 and coil 76 pilot valve 74 is energized by the normal operation of the sensor 70 to connect its ports P1 and P2.
  • valve V When it is desired to close valve V, in normal operation of the system, the coil 84 of control valve 82 is deenergized by opening switch S (FIG. 7) and the spring 87 controlling the valve 82 will move the movable member thereof to connect ports P-4 and P-6 as well as Ports P-5 and P-7. Since the coil 76 of pilot valve 74 remains energized through sensor 70, the fluid under pressure from pump P will flow through ports P-1, P-2, to conduit 85 and through ports P-4, P-6 into port P-9 of rotary actuator 83 to move the vane 86 thereof to the closed valve position shown in FIG. 7.
  • the rotary actuator 83 may be operated to open and close the valve V from a remote position through switch S and so long as the system is operating properly, the spring 65 of the fail-safe actuator will remain in cocked condition.
  • both the coils 84 and 76 of the control valve 82 and pilot valve 74 are deenergized automatically due to the action of sensor 70 which detects such failure.
  • the springs 87 and 77 associated with said valves 82 and 74 respectively will move them to the positions shown in FIG. 5 in which ports P-4, P-6 and P-5, P-7 of control valve 82 are connected and ports P-2, P-3 of valve 74 are connected.
  • the fluid in the rotary actuator 83 can be discharged through port P-8 thereof and through ports P-5, P-7 of control valve 82 to reservoir R, so that the shaft 83' of actuator 83 is free to rotate.
  • a fail-safe actuator and system incorporating said actuator including a spring member as an energy storing means which fail-safe actuator has the advantage of permitting the system to be operated without cycling the spring.
  • the ability to actuate the system through normal operating cycles without affecting the position of the spring reduces the amount of energy required for normal operation since the force of the spring need not be overcome, and also increases the duty cycle of the spring by eliminating metal fatigue which accompanies cycling and recycling of the spring, as required in fail-safe systems heretofore known.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Fluid-Driven Valves (AREA)
  • Actuator (AREA)
  • Valve Device For Special Equipments (AREA)
US06/065,368 1979-08-09 1979-08-09 Fail-safe actuator and hydraulic system incorporating the same Expired - Lifetime US4295630A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US06/065,368 US4295630A (en) 1979-08-09 1979-08-09 Fail-safe actuator and hydraulic system incorporating the same
CA000350970A CA1140837A (en) 1979-08-09 1980-04-30 Fail-safe actuator and hydraulic system incorporating the same
JP9491580A JPS5628304A (en) 1979-08-09 1980-07-11 Emergency shutoff actuator
DE19803027181 DE3027181A1 (de) 1979-08-09 1980-07-18 Ausfallsicheres verstellorgan
SE8005576A SE8005576L (sv) 1979-08-09 1980-08-06 Hydraliskt system med en sekerhetsanordning
US06/281,087 US4412670A (en) 1979-08-09 1981-07-07 Fail-safe actuator and hydraulic system incorporating the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/065,368 US4295630A (en) 1979-08-09 1979-08-09 Fail-safe actuator and hydraulic system incorporating the same

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US06/281,087 Division US4412670A (en) 1979-08-09 1981-07-07 Fail-safe actuator and hydraulic system incorporating the same

Publications (1)

Publication Number Publication Date
US4295630A true US4295630A (en) 1981-10-20

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Application Number Title Priority Date Filing Date
US06/065,368 Expired - Lifetime US4295630A (en) 1979-08-09 1979-08-09 Fail-safe actuator and hydraulic system incorporating the same

Country Status (5)

Country Link
US (1) US4295630A (sv)
JP (1) JPS5628304A (sv)
CA (1) CA1140837A (sv)
DE (1) DE3027181A1 (sv)
SE (1) SE8005576L (sv)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4527769A (en) * 1983-10-03 1985-07-09 Xomox Corporation Apparatus for moving a controlled member to a predetermined position
EP0192973A1 (en) * 1985-02-26 1986-09-03 Vetco Gray Inc. Fail-safe valve actuator
US5762315A (en) * 1996-04-10 1998-06-09 Fisher Controls International, Inc. Valve actuator with pliable pressure conversion device
US5853022A (en) * 1996-04-10 1998-12-29 Fisher Controls International, Inc. Valve actuator with instrument mounting manifold
US5975487A (en) * 1997-04-25 1999-11-02 Fisher Controls International, Inc. Rotary valve actuator with high-low-high torque linkage
US5979864A (en) * 1997-04-25 1999-11-09 Fisher Controls International, Inc. Double convoluted pliable pressure conversion unit
US5988205A (en) * 1997-04-25 1999-11-23 Fisher Controls International, Inc. Rotary valve actuator with zero lost motion universal connection
US6000675A (en) * 1997-04-25 1999-12-14 Fisher Controls International, Inc. Tension-spring return rotary valve actuator
US6062534A (en) * 1997-04-25 2000-05-16 Fisher Controls International Double acting rotary valve actuator
US6446539B1 (en) * 2000-12-14 2002-09-10 Leopold J. Niessen Dual end stop actuator and method
US6568422B2 (en) * 2000-12-14 2003-05-27 Leopold J. Niessen Valve locking mechanism and method
WO2004010007A2 (en) * 2002-07-18 2004-01-29 Phd, Inc. Rotary actuator assembly
US7334773B2 (en) 2005-08-16 2008-02-26 Honeywell International, Inc. Outflow valve having a cable operated closure mechanism
US20100187454A1 (en) * 2009-01-27 2010-07-29 David Anthony Arnold Actuator having an override apparatus
US20110155937A1 (en) * 2009-12-28 2011-06-30 David Anthony Arnold Apparartus to increase a force of an actuator having an override apparatus
US9702442B2 (en) * 2015-11-03 2017-07-11 Emerson Process Management, Valve Automation, Inc. Rotary actuators with chain operated cams
US20170254439A1 (en) * 2014-11-26 2017-09-07 Velan Abv S.R.L. An actuating system for a quarter-turn rotary valve

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5950427A (en) * 1997-11-18 1999-09-14 Worcester Controls Licensco, Inc. Fail-safe electric hydraulic actuator
JP3902489B2 (ja) 2002-03-04 2007-04-04 エフアイエス株式会社 ガスクロマトグラフ装置及び呼気成分分析装置

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3028842A (en) * 1960-04-21 1962-04-10 Berg Airlectro Products Co Parking brake chamber
US3051143A (en) * 1961-04-19 1962-08-28 Michael J Nee Actuator
US3144812A (en) * 1961-09-05 1964-08-18 Explorer Res Co Emergency actuator for air brake system
US3542331A (en) * 1968-05-17 1970-11-24 Otis Eng Corp Valves
DE2203476A1 (de) * 1972-01-26 1973-08-02 Walter Theobald Hydraulischer motor-zylinder-differentialtrieb
US3801062A (en) * 1973-05-25 1974-04-02 Contromatics Corp Manual valve override
US3839945A (en) * 1972-05-05 1974-10-08 Greer Hydraulics Inc Rotary actuator
US4003547A (en) * 1972-06-26 1977-01-18 Lone Star Industries, Inc. Valve operator
US4121840A (en) * 1977-01-10 1978-10-24 Tol-O-Matic Inc. Seal assembly
US4203292A (en) * 1977-09-22 1980-05-20 Zahnradfabrik Friedrichshafen, Ag Hydraulic auxiliary power steering with energy supply arrangement

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1056288A (sv) * 1954-02-25
FR1115033A (fr) * 1954-11-23 1956-04-18 Applevage Commande hydraulique à double effet

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3028842A (en) * 1960-04-21 1962-04-10 Berg Airlectro Products Co Parking brake chamber
US3051143A (en) * 1961-04-19 1962-08-28 Michael J Nee Actuator
US3144812A (en) * 1961-09-05 1964-08-18 Explorer Res Co Emergency actuator for air brake system
US3542331A (en) * 1968-05-17 1970-11-24 Otis Eng Corp Valves
DE2203476A1 (de) * 1972-01-26 1973-08-02 Walter Theobald Hydraulischer motor-zylinder-differentialtrieb
US3839945A (en) * 1972-05-05 1974-10-08 Greer Hydraulics Inc Rotary actuator
US4003547A (en) * 1972-06-26 1977-01-18 Lone Star Industries, Inc. Valve operator
US3801062A (en) * 1973-05-25 1974-04-02 Contromatics Corp Manual valve override
US4121840A (en) * 1977-01-10 1978-10-24 Tol-O-Matic Inc. Seal assembly
US4203292A (en) * 1977-09-22 1980-05-20 Zahnradfabrik Friedrichshafen, Ag Hydraulic auxiliary power steering with energy supply arrangement

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4527769A (en) * 1983-10-03 1985-07-09 Xomox Corporation Apparatus for moving a controlled member to a predetermined position
EP0192973A1 (en) * 1985-02-26 1986-09-03 Vetco Gray Inc. Fail-safe valve actuator
US5762315A (en) * 1996-04-10 1998-06-09 Fisher Controls International, Inc. Valve actuator with pliable pressure conversion device
US5853022A (en) * 1996-04-10 1998-12-29 Fisher Controls International, Inc. Valve actuator with instrument mounting manifold
US5975487A (en) * 1997-04-25 1999-11-02 Fisher Controls International, Inc. Rotary valve actuator with high-low-high torque linkage
US5979864A (en) * 1997-04-25 1999-11-09 Fisher Controls International, Inc. Double convoluted pliable pressure conversion unit
US5988205A (en) * 1997-04-25 1999-11-23 Fisher Controls International, Inc. Rotary valve actuator with zero lost motion universal connection
US6000675A (en) * 1997-04-25 1999-12-14 Fisher Controls International, Inc. Tension-spring return rotary valve actuator
US6062534A (en) * 1997-04-25 2000-05-16 Fisher Controls International Double acting rotary valve actuator
US6655256B2 (en) * 2000-12-14 2003-12-02 Leopold J. Niessen End stops for dual end stop actuator and method
US6568422B2 (en) * 2000-12-14 2003-05-27 Leopold J. Niessen Valve locking mechanism and method
US6598511B2 (en) * 2000-12-14 2003-07-29 Leopold J. Niessen Dual end stop actuator rotary drive and method
US6604449B2 (en) * 2000-12-14 2003-08-12 Leopold J. Niessen Quarter-turn dual end stop actuator and method
US6604448B2 (en) * 2000-12-14 2003-08-12 Leopold J. Niessen Dual end stop actuator and method
US6612220B2 (en) * 2000-12-14 2003-09-02 Leopold J. Niessen First adjust dual end stop actuator and method
US6612219B2 (en) * 2000-12-14 2003-09-02 Leopold J. Niessen Adaptor plate for dual end stop actuator and method
US6446539B1 (en) * 2000-12-14 2002-09-10 Leopold J. Niessen Dual end stop actuator and method
WO2004010007A2 (en) * 2002-07-18 2004-01-29 Phd, Inc. Rotary actuator assembly
WO2004010007A3 (en) * 2002-07-18 2004-06-10 Phd Inc Rotary actuator assembly
US20040123734A1 (en) * 2002-07-18 2004-07-01 Morr Glen A. Rotary actuator assembly
US6988440B2 (en) 2002-07-18 2006-01-24 Phd, Inc. Rotary actuator assembly
US7334773B2 (en) 2005-08-16 2008-02-26 Honeywell International, Inc. Outflow valve having a cable operated closure mechanism
US20100187454A1 (en) * 2009-01-27 2010-07-29 David Anthony Arnold Actuator having an override apparatus
US8794589B2 (en) 2009-01-27 2014-08-05 Fisher Controls International, Llc Actuator having an override apparatus
US20110155937A1 (en) * 2009-12-28 2011-06-30 David Anthony Arnold Apparartus to increase a force of an actuator having an override apparatus
WO2011081722A1 (en) * 2009-12-28 2011-07-07 Fisher Controls International Llc Apparatus to increase a force of an actuator having an override apparatus
CN102753840A (zh) * 2009-12-28 2012-10-24 费希尔控制国际公司 用于增加具有超驰装置的致动器的力的装置
US8549984B2 (en) * 2009-12-28 2013-10-08 Fisher Controls International, Llc Apparatus to increase a force of an actuator having an override apparatus
RU2558487C2 (ru) * 2009-12-28 2015-08-10 Фишер Контролз Интернешнел Ллс Устройство для увеличения усиления привода с блокирующим устройством
CN102753840B (zh) * 2009-12-28 2015-08-19 费希尔控制国际公司 用于增加具有超驰装置的致动器的力的装置
AU2010337322B2 (en) * 2009-12-28 2016-05-19 Fisher Controls International Llc Apparatus to increase a force of an actuator having an override apparatus
US20170254439A1 (en) * 2014-11-26 2017-09-07 Velan Abv S.R.L. An actuating system for a quarter-turn rotary valve
US10125893B2 (en) * 2014-11-26 2018-11-13 Velan Abv S.R.L. Actuating system for a quarter-turn rotary valve
US9702442B2 (en) * 2015-11-03 2017-07-11 Emerson Process Management, Valve Automation, Inc. Rotary actuators with chain operated cams

Also Published As

Publication number Publication date
CA1140837A (en) 1983-02-08
SE8005576L (sv) 1981-02-10
JPS5628304A (en) 1981-03-19
DE3027181A1 (de) 1981-02-26
JPS612801B2 (sv) 1986-01-28

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